NixOS must generate audit records when successful/unsuccessful attempts to delete security objects occur.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-268165	SRG-OS-000468-GPOS-00212	ANIX-00-001740	SV-268165r1131135_rule	2025-08-19	1

Description
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).

ℹ️ Check
Verify that NixOS generates audit records when successful/unsuccessful attempts to delete security objects occur with the following command: $ sudo auditctl -l \| grep /bin/ch -a always,exit -S all -F path=/run/current-system/sw/bin/chage -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-chage -a always,exit -S all -F path=/run/current-system/sw/bin/chcon -F perm=x -F auid>=1000 -F auid!=-1 -k perm_mod If the command does not return an audit rule for "chage" and "chcon", this is a finding.

ℹ️ Check

Verify that NixOS generates audit records when successful/unsuccessful attempts to delete security objects occur with the following command: $ sudo auditctl -l | grep /bin/ch -a always,exit -S all -F path=/run/current-system/sw/bin/chage -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-chage -a always,exit -S all -F path=/run/current-system/sw/bin/chcon -F perm=x -F auid>=1000 -F auid!=-1 -k perm_mod If the command does not return an audit rule for "chage" and "chcon", this is a finding.

✔️ Fix
Configure NixOS to audit attempts to delete security objects. Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: security.audit.rules = [ "-a always,exit -F path=/run/current-system/sw/bin/chage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-chage" "-a always,exit -F path=/run/current-system/sw/bin/chcon -F perm=x -F auid>=1000 -F auid!=unset -k perm_mod" ]; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch

✔️ Fix

Configure NixOS to audit attempts to delete security objects. Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: security.audit.rules = [ "-a always,exit -F path=/run/current-system/sw/bin/chage -F perm=x -F auid>=1000 -F auid!=unset -k privileged-chage" "-a always,exit -F path=/run/current-system/sw/bin/chcon -F perm=x -F auid>=1000 -F auid!=unset -k perm_mod" ]; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch